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Abstract and Introduction 

Study Design and Statistics

Margaret A. Winker

and Stephen J. Lurie

UPDATE: We will discontinue using quotation marks to identify parts of an article, but retain the capitalization; eg, This is discussed in the Methods section (not the “Methods” section). This change was made February 14, 2013. The structured abstract should enable the reader to assess the study hypothesis and methods quickly and easily. The context for the study question and the hypothesis (objective) should be clearly stated (eg, “To determine whether enalapril reduces left ventricular mass …”), the study design and and setting from which the sample was drawn described, and the main outcome measures explained. The results should include

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